The problem is that a VM isn't a single file - it's a collection, and they are constantly changing. So your backup may have files from different times, resulting in a corrupt VM. This is even worse if your virtual disk is split into 2GB chunks, and when pruning starts, it gets even worse. Plus, you're wasting backup space - the entire virtual disk changes every single hour, so you're backing up 10-40GB you don't need to.
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